期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2017
卷号：6
期号：7
页码：12515
DOI：10.15680/IJIRSET.2017.0607008
出版社：S&S Publications
摘要：The constraints imposed by leptogenesis on the validity of neutrino mass models describing thepresently available neutrino mass patterns, are investigated numerically.We first parameterize the light lefthandedMajorana neutrino mass matrices describing the possible patterns of neutrino masses viz, quasidegenerate,inverted hierarchical and normal hierarchical, which obey the μ↔τ symmetry. As a first test, thesemass matrices predict the neutrino mass parameters and mixings consistent with neutrino oscillation data, and allthe three input parameters are fixed at this stage. Next, these mass matrices are employed to estimate thebaryon asymmetry of the universe, in both thermal and non-thermal leptogenesis scenario. We use the CPviolating Majorana phases derived from right-handed Majorana mass matrix, and also three possible forms ofDirac neutrino mass matrices in the calculation. The overall analysis shows that normal hierarchical modelappears to be the most favourable choice in nature. The present analysis though phenomenological, may serveas additional criteria to discard some of the presently available neutrino mass models. The conclusion alsoagrees with other criteria such as stability under quantum radiative corrections. We also observe someenhancement effects in flavour leptogenesis compared to non-flavour leptogenesis. Further enhancementfrom brane world cosmology may marginally modify the present finding.
